/**
 * Copyright 1996 self.com.au
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License. (http://www.apache.org/licenses/LICENSE-2.0)
 *
 * Unless required by applicable law or agreed to in writing, software distributed under the License is distributed 
 * on an "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the License for 
 * the specific language governing permissions and limitations under the License.
 *
 * <dhamma-message src="Atisha (11th century Tibetan Buddhist master)">
 * 	The greatest achievement is selflessness. The greatest worth is self-mastery.
 * 	The greatest quality is seeking to serve others. The greatest precept is continual awareness.
 * 	The greatest medicine is the emptiness of everything. The greatest action is not conforming with the worlds ways.
 * 	The greatest magic is transmuting the passions. The greatest generosity is non-attachment.
 * 	The greatest goodness is a peaceful mind. The greatest patience is humility.
 * 	The greatest effort is not concerned with results. The greatest meditation is a mind that lets go.
 * 	The greatest wisdom is seeing through appearances. 
 * </dhamma-message>
 *
 * @author Ashin Wimalajeewa
 *
 * Note, this is a very old runtime library that I have evolved since 1996. I rarely use it
 * now because the Apache Commons project has made it obsolete.
 */
/**
 * Copyright (C) 2003 by Self Technologies. All rights reserved.
 *
 * This software is the proprietary information of Self Technologies, Pty Ltd.
 * Use is subject to license terms.
 */
package self.util.zip;

import java.io.BufferedOutputStream;
import java.io.File;
import java.io.FileOutputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.Enumeration;
import java.util.zip.ZipEntry;
import java.util.zip.ZipFile;

import self.io.PathUtils;
import self.io.TransferUtils;

public class ZipDirectoryDeflator {
	private int	bufferSize;
	private boolean overwrite;
	private String outputPath;
	private File sourceZip;
	private ArrayList errorLog = new ArrayList();
	
	public ZipDirectoryDeflator( int bufferSize, File sourceZipFile, boolean overwrite, String outputTo ) {
		sourceZip = sourceZipFile;
		this.overwrite = overwrite;
		outputPath = outputTo;
		this.bufferSize = bufferSize;
	}
	
	public void run( EntryConfigurationListener callback ) throws IOException {
		final ZipFile zip = new ZipFile( sourceZip );
		try {
			final Enumeration en = zip.entries();
			while (en.hasMoreElements()) {
				final ZipEntry entry = (ZipEntry) en.nextElement();
				extractEntry( zip, entry, callback );
			}		
		} finally {
			zip.close();
		}
	}
	
	private void extractEntry( ZipFile zipFile, ZipEntry entry, EntryConfigurationListener callback ) throws IOException {
		String name = entry.getName();
    if ( entry.isDirectory() )     // some zips have Folder entries
    	createFolders( name );
    else 
    	writeFile( zipFile, entry, name, callback );
	}
	
	private void createFolders( String folderPath ) {
		String targetPath = configurePath( folderPath );
		File targetFolder = new File( targetPath );
		targetFolder.mkdirs();
	}
	
	private String configurePath( String path ) {
		String targetPath = PathUtils.makePathEndWithSlash( outputPath );
		if ( path.startsWith("/") )
			targetPath = targetPath + path.substring( 1 );
		else
			targetPath = targetPath + path;
		return targetPath.replace( '\\', '/' );
	}
	
	private void writeFile( ZipFile zipFile, ZipEntry entry, String fullName, EntryConfigurationListener callback ) throws IOException {
		String targetPath = configurePath( fullName );
		File targetFile = new File( targetPath );
		if ( targetFile.exists() && !overwrite ) {
			errorLog.add( "skipping file: " + fullName );
			return;
		}
		
		if ( callback != null )
			callback.configure( entry );
		
		final String parentPath = PathUtils.toParentPath( fullName );
		createFolders( parentPath );
		
	    final FileOutputStream fos = new FileOutputStream( targetFile );
	    final BufferedOutputStream bos = new BufferedOutputStream( fos );
	    try {
	      final InputStream zipIn = zipFile.getInputStream( entry );
	      try {
	        TransferUtils.transfer( zipIn, bos, bufferSize );
	      } finally {
	        zipIn.close();
	      }
	    } finally {
	      bos.close();
	    }
	}
	
//	static public void main( String[] args ) throws IOException {
//		File src = new File("C:/localdata/cAID/test.zip" );
//		ZipDirectoryDeflator unzipper = new ZipDirectoryDeflator( 512000, src, false, "C:/localdata/cAID/temp" );
//		unzipper.run( null );
//	}
}
